Final answer:
Humans are consumers, specifically omnivores, because they eat both plants and animals. They are not decomposers nor producers in the context of an ecosystem.
Step-by-step explanation:
The statement that applies to humans is that humans are consumers. Consumers are organisms that depend on other organisms for food, which includes all animals, certain fungi, many bacteria, and even a few plants with unique feeding strategies. More specifically, humans are classified as omnivores, which means they eat both plants (producers) and animals (other consumers).
Decomposers are organisms that break down dead material and waste products, releasing nutrients like carbon and nitrogen back into the environment. These are essential for the stability and survival of an ecosystem. Humans do not fulfill this role.
While humans are biological organisms composed of nutrients, we are not "nutrients" in the context of an ecosystem's food chain. Likewise, we are not producers, as we do not create our own food through processes such as photosynthesis.